package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 拦截器
 *
 * @Author:宿世新
 * @Dte:2022/7/15
 */
public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 通过MvcConfig来获取stringRedisTemplate对象
     *
     * @param stringRedisTemplate
     */
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // TODO 1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            return true;
        }
        // TODO 2.基于token获取redis中的用户
        String key = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().entries(key);
        // TODO 3.判断用户是否存在
        if (userMap.isEmpty()) {
            // TODO 放行
            return true;
        } else {
            // TODO 5.将查询到的Hash数据转为UserDTO对象
            UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
            // TODO 6.存在，保存用户信息到ThreadLocal
            UserHolder.saveUser(userDTO);
            // TODO 7.刷新token有效期
            stringRedisTemplate.expire(key, RedisConstants.LOGIN_USER_TTL, TimeUnit.MINUTES);
            // TODO 8.放行
            return true;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
    }
}
